rebuilt master brake cylinders??

Fellow Syncronauts!

     I wanted to hear from any of you that have installed rebuilt master
brake cylinders.  What has been your experience??  How long did they
last??
     I got an ITM 2-3 yrs ago that has only lasted that long...  It only
had a 1 yr warrantee...  Cost about $60.
  I'm now considering two brands from FLAPS that have LIFETIME
warrantees:  A-1 Cordon for $100. or a "Duralast"  for $85....
  Whatda ya think??  Thanks,

Cmdr. Syncronaut Peter Igo
'87 Westy Syncro 70K?